Principal Investigator / Author(s): Shibamoto, Takayuki

Contractor: UC Davis

Contract Number: 92-314

At the request of the California Department of Pesticide Regulation (DPR) and the Air Resources Board (ARB) Toxic Air Contaminant Identification Branch, the ARB Engineering Evaluation Branch (EEB) conducts two types of pesticide air monitoring programs: 1) three-day source impacted ambient monitoring adjacent to a recently applied field (application monitoring) and 2) four-week ambient monitoring in population centers located in the vicinity of expected applications (ambient monitoring). As required by Food and Agricultural Code Section 14022, this monitoring is conducted to provide DPR with data for the evaluation of the persistence and public exposure of airborne pesticides.

For some pesticides there are no validated air sampling and analytical methods. Chapters 1 and 2 contain the research, conducted by the University of California Davis, Department of Environmental Toxicology, Trace Analytical Laboratory (TAL), on method development and validation for carbofuran and captan. This research enabled the ARB / EEB to collect samples and calculate ambient concentrations in the three monitoring studies described in this report (Appendices I, II and XII). The ARB Quality Assurance Section carried out audits of the flow rate of the air samplers used in the monitoring, and a system audit of the TAL to review sample handling and storage procedures, analytical methodology and method validation (Appendices IV and V).

These studies were: an application monitoring for carbofuran (Appendix I), and ambient (Appendix II) and application (Appendix III) monitoring for captan and its breakdown product, tetrahydrophthalimide (THPI). All samples were collected by ARB / EEB and analyzed by the TAL.

For questions regarding this research project, including available data and progress status, contact:
Heather Choi
at (916) 322-3893